[linux-next] LinuxNextTracking branch, master, updated. next-20180305

batman at open-mesh.org batman at open-mesh.org
Tue Mar 6 00:16:38 CET 2018

The following commit has been merged in the master branch:
commit 3bf2a09da956b43ecfaa630a2ef9a477f991a46a
Author: Matthias Schiffer <mschiffer at universe-factory.net>
Date:   Tue Jan 23 10:59:50 2018 +0100

    batman-adv: invalidate checksum on fragment reassembly
    A more sophisticated implementation could try to combine fragment checksums
    when all fragments have CHECKSUM_COMPLETE and are split at even offsets.
    For now, we just set ip_summed to CHECKSUM_NONE to avoid "hw csum failure"
    warnings in the kernel log when fragmented frames are received. In
    consequence, skb_pull_rcsum() can be replaced with skb_pull().
    Note that in usual setups, packets don't reach batman-adv with
    CHECKSUM_COMPLETE (I assume NICs bail out of checksumming when they see
    batadv's ethtype?), which is why the log messages do not occur on every
    system using batman-adv. I could reproduce this issue by stacking
    batman-adv on top of a VXLAN interface.
    Fixes: 610bfc6bc99b ("batman-adv: Receive fragmented packets and merge")
    Tested-by: Maximilian Wilhelm <max at sdn.clinic>
    Signed-off-by: Matthias Schiffer <mschiffer at universe-factory.net>
    Signed-off-by: Sven Eckelmann <sven at narfation.org>
    Signed-off-by: Simon Wunderlich <sw at simonwunderlich.de>

diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
index 22dde42fd80e..5afe641ee4b0 100644
--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -288,7 +288,8 @@ batadv_frag_merge_packets(struct hlist_head *chain)
 	/* Move the existing MAC header to just before the payload. (Override
 	 * the fragment header.)
-	skb_pull_rcsum(skb_out, hdr_size);
+	skb_pull(skb_out, hdr_size);
+	skb_out->ip_summed = CHECKSUM_NONE;
 	memmove(skb_out->data - ETH_HLEN, skb_mac_header(skb_out), ETH_HLEN);
 	skb_set_mac_header(skb_out, -ETH_HLEN);


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